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https://issues.apache.org/jira/browse/HIVE-24201?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Pritha Dawn reassigned HIVE-24201:
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Assignee: Pritha Dawn (was: Pritha Dawn)
> WorkloadManager can support delayed move if destination pool does not have
> enough sessions
> ------------------------------------------------------------------------------------------
>
> Key: HIVE-24201
> URL: https://issues.apache.org/jira/browse/HIVE-24201
> Project: Hive
> Issue Type: Improvement
> Components: HiveServer2, llap
> Affects Versions: 4.0.0
> Reporter: Adesh Kumar Rao
> Assignee: Pritha Dawn
> Priority: Minor
> Labels: pull-request-available
> Fix For: 4.0.0
>
> Attachments: DelayedMoveDesign.pdf
>
> Time Spent: 2.5h
> Remaining Estimate: 0h
>
> To reproduce, create a resource plan with move trigger, like below:
> {code:java}
> +----------------------------------------------------+
> | line |
> +----------------------------------------------------+
> | experiment[status=DISABLED,parallelism=null,defaultPool=default] |
> | + default[allocFraction=0.888,schedulingPolicy=null,parallelism=1] |
> | | mapped for default |
> | + pool2[allocFraction=0.1,schedulingPolicy=fair,parallelism=1] |
> | | trigger t1: if (ELAPSED_TIME > 20) { MOVE TO pool1 } |
> | | mapped for users: abcd |
> | + pool1[allocFraction=0.012,schedulingPolicy=null,parallelism=1] |
> | | mapped for users: efgh |
>
> {code}
> Now, run two queries in pool1 and pool2 using different users. The query
> running in pool2 will tried to move to pool1 and it will get killed because
> pool1 will not have session to handle the query.
> Currently, the Workload management move trigger kills the query being moved
> to a different pool if destination pool does not have enough capacity. We
> could have a "delayed move" configuration which lets the query run in the
> source pool as long as possible, if the destination pool is full. It will
> attempt the move to destination pool only when there is claim upon the source
> pool or capacity available in the destination pool. If the destination pool
> is not full, delayed move behaves as normal move i.e. the move will happen
> immediately.
>
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